1 /* $OpenBSD: nfsd.c,v 1.44 2025/01/11 18:21:02 kn Exp $ */ 2 /* $NetBSD: nfsd.c,v 1.19 1996/02/18 23:18:56 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/ioctl.h> 37 #include <sys/stat.h> 38 #include <sys/wait.h> 39 #include <sys/uio.h> 40 #include <sys/ucred.h> 41 #include <sys/mount.h> 42 #include <sys/socket.h> 43 44 #include <rpc/rpc.h> 45 #include <rpc/pmap_clnt.h> 46 #include <rpc/pmap_prot.h> 47 48 #include <nfs/rpcv2.h> 49 #include <nfs/nfsproto.h> 50 #include <nfs/nfs.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <grp.h> 56 #include <pwd.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <syslog.h> 62 #include <unistd.h> 63 64 /* Global defs */ 65 #ifdef DEBUG 66 #define syslog(e, s, ...) \ 67 do { \ 68 fprintf(stderr, (s), ##__VA_ARGS__); \ 69 fprintf(stderr, "\n"); \ 70 } while (0) 71 int debug = 1; 72 #else 73 int debug = 0; 74 #endif 75 76 struct nfsd_srvargs nsd; 77 78 void nonfs(int); 79 void reapchild(int); 80 void usage(void); 81 82 #define MAXNFSDCNT 20 83 #define DEFNFSDCNT 4 84 85 /* 86 * Nfs server daemon mostly just a user context for nfssvc() 87 * 88 * 1 - do file descriptor and signal cleanup 89 * 2 - fork the nfsd(s) 90 * 3 - create server socket(s) 91 * 4 - register socket with portmap 92 * 93 * For connectionless protocols, just pass the socket into the kernel via. 94 * nfssvc(). 95 * For connection based sockets, loop doing accepts. When you get a new 96 * socket from accept, pass the msgsock into the kernel via. nfssvc(). 97 * The arguments are: 98 * -r - reregister with portmapper 99 * -t - support tcp nfs clients 100 * -u - support udp nfs clients 101 * followed by "n" which is the number of nfsds' to fork off 102 */ 103 int 104 main(int argc, char *argv[]) 105 { 106 struct nfsd_args nfsdargs; 107 struct sockaddr_in inetaddr; 108 int ch, i; 109 int nfsdcnt = DEFNFSDCNT, on, reregister = 0, sock; 110 int udpflag = 0, tcpflag = 0, tcpsock; 111 const char *errstr = NULL; 112 113 /* Start by writing to both console and log. */ 114 openlog("nfsd", LOG_PID | LOG_PERROR, LOG_DAEMON); 115 116 while ((ch = getopt(argc, argv, "n:rtu")) != -1) 117 switch (ch) { 118 case 'n': 119 nfsdcnt = strtonum(optarg, 1, MAXNFSDCNT, &errstr); 120 if (errstr) { 121 syslog(LOG_ERR, "nfsd count is %s: %s", errstr, optarg); 122 return(1); 123 } 124 break; 125 case 'r': 126 reregister = 1; 127 break; 128 case 't': 129 tcpflag = 1; 130 break; 131 case 'u': 132 udpflag = 1; 133 break; 134 default: 135 usage(); 136 } 137 argv += optind; 138 argc -= optind; 139 140 if (!(tcpflag || udpflag)) 141 udpflag = 1; 142 143 /* 144 * XXX 145 * Backward compatibility, trailing number is the count of daemons. 146 */ 147 if (argc > 1) 148 usage(); 149 if (argc == 1) { 150 nfsdcnt = strtonum(argv[0], 1, MAXNFSDCNT, &errstr); 151 if (errstr) { 152 syslog(LOG_ERR, "nfsd count is %s: %s", errstr, optarg); 153 return(1); 154 } 155 } 156 157 if (debug == 0) { 158 daemon(0, 0); 159 (void)signal(SIGHUP, SIG_IGN); 160 (void)signal(SIGINT, SIG_IGN); 161 (void)signal(SIGQUIT, SIG_IGN); 162 (void)signal(SIGSYS, nonfs); 163 } 164 (void)signal(SIGCHLD, reapchild); 165 166 if (reregister) { 167 if (udpflag && 168 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 169 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT))) { 170 syslog(LOG_ERR, "can't register with portmap for UDP (%s).", 171 strerror(errno)); 172 return (1); 173 } 174 if (tcpflag && 175 (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 176 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT))) { 177 syslog(LOG_ERR, "can't register with portmap for TCP (%s).", 178 strerror(errno)); 179 return (1); 180 } 181 return (0); 182 } 183 184 /* Cut back to writing to log only. */ 185 closelog(); 186 openlog("nfsd", LOG_PID, LOG_DAEMON); 187 188 for (i = 0; i < nfsdcnt; i++) { 189 switch (fork()) { 190 case -1: 191 syslog(LOG_ERR, "fork: %s", strerror(errno)); 192 return (1); 193 case 0: 194 break; 195 default: 196 continue; 197 } 198 199 setproctitle("server"); 200 nsd.nsd_nfsd = NULL; 201 if (nfssvc(NFSSVC_NFSD, &nsd) == -1) { 202 syslog(LOG_ERR, "nfssvc: %s", strerror(errno)); 203 return (1); 204 } 205 return (0); 206 } 207 208 /* If we are serving udp, set up the socket. */ 209 if (udpflag) { 210 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { 211 syslog(LOG_ERR, "can't create udp socket"); 212 return (1); 213 } 214 memset(&inetaddr, 0, sizeof inetaddr); 215 inetaddr.sin_family = AF_INET; 216 inetaddr.sin_addr.s_addr = INADDR_ANY; 217 inetaddr.sin_port = htons(NFS_PORT); 218 inetaddr.sin_len = sizeof(inetaddr); 219 if (bind(sock, (struct sockaddr *)&inetaddr, 220 sizeof(inetaddr)) == -1) { 221 syslog(LOG_ERR, "can't bind udp addr"); 222 return (1); 223 } 224 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_UDP, NFS_PORT) || 225 !pmap_set(RPCPROG_NFS, 3, IPPROTO_UDP, NFS_PORT)) { 226 syslog(LOG_ERR, "can't register with udp portmap"); 227 return (1); 228 } 229 nfsdargs.sock = sock; 230 nfsdargs.name = NULL; 231 nfsdargs.namelen = 0; 232 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) == -1) { 233 syslog(LOG_ERR, "can't Add UDP socket"); 234 return (1); 235 } 236 (void)close(sock); 237 } 238 239 /* Now set up the master server socket waiting for tcp connections. */ 240 on = 1; 241 if (!tcpflag) 242 return (0); 243 244 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 245 syslog(LOG_ERR, "can't create tcp socket"); 246 return (1); 247 } 248 if (setsockopt(tcpsock, 249 SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) 250 syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %s", strerror(errno)); 251 memset(&inetaddr, 0, sizeof inetaddr); 252 inetaddr.sin_family = AF_INET; 253 inetaddr.sin_addr.s_addr = INADDR_ANY; 254 inetaddr.sin_port = htons(NFS_PORT); 255 inetaddr.sin_len = sizeof(inetaddr); 256 if (bind(tcpsock, (struct sockaddr *)&inetaddr, 257 sizeof (inetaddr)) == -1) { 258 syslog(LOG_ERR, "can't bind tcp addr"); 259 return (1); 260 } 261 if (listen(tcpsock, 5) == -1) { 262 syslog(LOG_ERR, "listen failed"); 263 return (1); 264 } 265 if (!pmap_set(RPCPROG_NFS, 2, IPPROTO_TCP, NFS_PORT) || 266 !pmap_set(RPCPROG_NFS, 3, IPPROTO_TCP, NFS_PORT)) { 267 syslog(LOG_ERR, "can't register tcp with portmap"); 268 return (1); 269 } 270 271 setproctitle("master"); 272 273 /* 274 * Loop forever accepting connections and passing the sockets 275 * into the kernel for the mounts. 276 */ 277 for (;;) { 278 struct sockaddr_in inetpeer; 279 int ret, msgsock; 280 socklen_t len = sizeof(inetpeer); 281 282 if ((msgsock = accept(tcpsock, 283 (struct sockaddr *)&inetpeer, &len)) == -1) { 284 if (errno == EWOULDBLOCK || errno == EINTR || 285 errno == ECONNABORTED) 286 continue; 287 syslog(LOG_ERR, "accept failed: %s", strerror(errno)); 288 return (1); 289 } 290 memset(inetpeer.sin_zero, 0, sizeof(inetpeer.sin_zero)); 291 if (setsockopt(msgsock, SOL_SOCKET, 292 SO_KEEPALIVE, &on, sizeof(on)) == -1) 293 syslog(LOG_ERR, 294 "setsockopt SO_KEEPALIVE: %s", strerror(errno)); 295 nfsdargs.sock = msgsock; 296 nfsdargs.name = (caddr_t)&inetpeer; 297 nfsdargs.namelen = len; 298 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) == -1) { 299 syslog(LOG_ERR, "can't Add TCP socket"); 300 } 301 (void)close(msgsock); 302 } 303 } 304 305 void 306 usage(void) 307 { 308 (void)fprintf(stderr, "usage: nfsd [-rtu] [-n num_servers]\n"); 309 exit(1); 310 } 311 312 void 313 nonfs(int signo) 314 { 315 int save_errno = errno; 316 struct syslog_data sdata = SYSLOG_DATA_INIT; 317 318 syslog_r(LOG_ERR, &sdata, "missing system call: NFS not available."); 319 errno = save_errno; 320 } 321 322 void 323 reapchild(int signo) 324 { 325 int save_errno = errno; 326 327 while (wait3(NULL, WNOHANG, NULL) > 0) 328 continue; 329 errno = save_errno; 330 } 331